Wraparound Mortgages in California — How They Work

A wraparound mortgage is a form of seller financing where the seller creates a new note for the full remaining sale price — larger than, and wrapped around, an existing underlying loan that stays in place on the property. The buyer makes one payment to the seller; the seller then uses part of that payment to keep making payments on their own original loan and keeps the difference. It's the tool sellers reach for specifically when they still owe money on a below-market-rate loan and want to profit on the spread rather than pay it off and lose that rate entirely.

In California, this is typically documented as an all-inclusive trust deed, or AITD — a deed of trust that wraps around and includes the balance of the underlying loan within the new, larger note amount. It only makes sense in specific circumstances, and it carries a real legal risk most sellers don't fully appreciate until it's explained plainly.

Say a seller in El Dorado County owes $250,000 on a loan at 3%, and sells the home for $450,000. Instead of paying off the $250,000 at closing, the seller wraps it into a new $450,000 note (after a down payment) carrying, say, a 6% rate. The buyer pays the seller on the full $450,000 balance; the seller continues paying their own lender on the original $250,000 loan out of what they collect. The seller earns 6% on the buyer's payment while still only paying 3% on the underlying loan — profiting on both the rate spread and the fact they're earning interest on money they don't actually have out (the $250,000 the underlying lender still holds).

Here's the risk. Almost every conventional mortgage contains a due-on-sale clause entitling the lender to call the full balance due the moment the property transfers ownership — and a wraparound sale is exactly the kind of transfer that clause is written to catch, since the underlying lender never approved the buyer and the seller is not paying off the loan. If the underlying lender discovers the transfer and chooses to enforce the clause, they can demand the full remaining balance immediately, which can unravel the whole arrangement if the seller can't refinance or pay it off on short notice. We cover exactly how that clause works and when lenders do or don't enforce it on our due-on-sale clause page — read it before wrapping a loan you're not confident is either assumable or unlikely to draw the lender's attention.

Because the seller is responsible for continuing to pay the underlying loan out of the buyer's payment, a missed or late payment by the seller — for any reason — puts the buyer's home at risk of the underlying lender foreclosing, even though the buyer has been paying on time. Many wraparound arrangements route through a neutral third-party servicing company specifically to prevent this: the buyer's payment goes to the servicer, the servicer pays the underlying lender directly, and the seller receives only the spread. This adds a modest cost but removes the single biggest point of failure in the whole structure.

A wraparound is worth considering when the underlying rate is meaningfully below today's market, the underlying loan isn't a government-backed product that's more easily assumed outright (in which case a straight assumption is usually cleaner — see our assumable mortgage guide), and the seller is comfortable with the due-on-sale exposure or has structured servicing to minimize the risk of the arrangement unraveling. It's a poor fit when the underlying lender is likely to actively monitor for transfers, or when the seller isn't in a position to pay off or refinance the underlying loan quickly if it's called due.